Fano-type interpretation of red shifts and red tails in hole array transmission spectra

Details Fano-type interpretation of red shifts and red tails in hole array transmission spectra Fano-type interpretation of red shifts and red tails in hole array transmission spectra

2004-01-12

arxiv.org/abs/physics/0401054v1

Optics Communications 225, 331 (2003)

Physics

Optics

5 pages

Scientific paper

10.1016/j.optcom.2003.07.037

We present a unifying point of view which allows to understand spectral features reported in recent experiments with two-dimensional arrays of subwavelength holes in metal films. We develop a Fano analysis of the related scattering problem by distinguishing two interfering contributions to the transmission process, namely a non-resonant contribution (direct scattering) and a resonant contribution (surface plasmon excitation). The introduction of a coupling strength between these two contributions naturally induces resonance shifts and asymmetry of profiles which satisfy simple scaling relations. We also report an experiment to confirm this analysis.

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